Tony Schwartz:

It turns out we each have one reservoir of will and discipline, and it gets progressively depleted by any act of conscious self-regulation. In other words, if you spend energy trying to resist a fragrant chocolate chip cookie, you’ll have less energy left over to solve a difficult problem. Will and discipline decline inexorably as the day wears on.

“Acts of choice,” the brilliant researcher Roy Baumeister and his colleagues have concluded, “draw on the same limited resource used for self-control.” That’s especially so in a world filled more than ever with potential temptations, distractions and sources of immediate gratification.

I met a man recently who has the same thing for lunch every day because it’s one less decision he has to make. This, apparently, is why.

Making Inconsequential Decisions Can Hinder Your Ability to Make Important Decisions